@article{oai:ir.soken.ac.jp:00003512,
 author = {池内 , 了 and YOSHIOKA, Satoshi and IKEUCHI, Satoru},
 issue = {2},
 journal = {Astrophysical Journal, Part 1, Astrophysical Journal, Part 1},
 month = {Sep},
 note = {application/pdf, We investigate the collision process of two cosmological shock waves produced by explosions by two-dimensional numerical hydrodynamical calculations in relation to the formation of large-scale structures. The numerical hydrodynamical code is designed to include self-gravity and cooling processes as well as the cosmic expansion. The structures resulting from the collisions can be classified into four categories by their global appearances: complete merging case, merging case with a dense ring at the intersection of the two shock waves, nonmerging case with a ring, and nonmerging case separated by a dense wall. From calculations with various parameters, we obtain the parameter dependence of the structures formed. The parameters searched, which affect the resultant structures, are the explosion redshift, the comoving distance between the two explosions, and the explosion energy for the case that two explosions are identical. In addition, we also calculate the cases that the explosion redshifts are different. From these, we explore the conditions for merging and ring formation, obtain their semianalytical expressions, and discuss the mechanism of ring formation: a ring is not produced by self-gravity, but it results from the cancellation of momenta in the direction perpendicular to the interaction plane at the collision. In addition, gravitational instability and fragmentation of expanding rings are examined. These results are discussed in relation to the formation of large-scale structures in the universe.},
 pages = {352--369},
 title = {Collision of cosmological shock waves produced by explosions and formation of large-scale structures},
 volume = {360},
 year = {1990}
}